Perforating and trimming mechanism



prl 14, 1931. H, BLOOD 1,800,925

PERFORMING AND TRIMMING MECHANISM Filed'nec. 17, 1928 Patented Apr. 14, 1931 UNITED STATES ...n-Mmm-u HAROLD LANGLEY BLOOD, OF HINSDALE, ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC "ii COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION' OF NEW YORK IEERFORATING AN TRIMMING MECHANISM Application filed December 17, 1928. Serial No. 326,475.

This invention relates to perforating and trimming mechanisms7 and more particularly to an apparatus for simultaneously punching the grid of a telephone transmitter ymouthpiece and trimming the molding iin from its edges.

In manufacturing vmolded transmitter mouthpieces, a molding lin is left on the edge of that portion of the mouthpiece having the largest peripheral dimension, and the bridge in the portion between the throat of the mouthpiece and the diaphragm oi the transmitter is not completely apertured. This necessitates removing the molding 1in and punching out the material remaining in the partially formed holes after the mouthpiece is taken from the molding machine. It has heretofore been the practice to take the molded mouthpiece to a turning or trimming device to remove the molding lin, and subsequently place the mouthpiece in a punch press to complete the holes in the bridge portion of the mouthpiece.

An object of this invention is the provision of an efhcient, simple, and easily operated apparatus for quickly perforating and trimming an article.

In accordance with one embodiment, the invention contemplates the provision of a ro tatable trimming device, the cutting edges of which rotate about a supporting member upon which the mouthpiece may be positioned and a plurality of perforating members reciprocable into and out of engagement with the mouthpiece positioned on the supporting member to punch through the material remaining in the partially formed holes in the bridge and move the mouthpiece past the cutting tools to trim the molding En therefrom. .i

This and other objects will be apparent from the following detailed description when considered .in conjunction with the accompanying drawings, wherein Fig. 1 is a side elevational view partly in section of a punching and trimming device embodying the features of this invention;

F ig. `2 is a sectional VView of a telephone mouthpiece previous to the removal of the molding fin and the excess material at the bridge portion, and

Fig. 3 is an enlarged view of the perforating die shown partly in section. j

Referring now to the drawings wherein like reference numerals designate similar parts throughout the several views, the numeral 9, designates generally a punching and trimming device embodying the features of this invention. A housing encloses a tool holder 11 which is rotatable about a sleeve 13, positioned in the housing by mea-ns of a cap 14 threaded on the end of the sleeve and engaging` an annular shoulder 15 formed on the housing, and annularspacers 17 and 18 cooperating with inner bearing races 19 and 21 which engage` annular shoulders 22 and 23, respectively, formed on the sleeve.

The tool holder is rotatable about the sleeve on ball bearings 25-25 and 26-26 mounted in inner bearing races 19 and 21 respectively, and outer bearing racesr 27 and 29, respectively, attached to the rotatable tool holder. A belt 30 driven by amotor, not shown, en-

gages a pulley formed on the tool holder and furnishes power to rotate the tool holder which has a pair of tools S33-33 clamped to projections 34-34 formed on an annular shoulder thereof. The tools are secured to the projections`34-34 by means of clamps 35-35 secured to the projections by screws 37-37 threaded in the projections and passingr through apertures 3S-38 in the clamps.

The sleeve 13 has a key way 39 formed therein in which a key 41 iiXed to a shaft 42 is slidable. Ay spring positioned between the cap 14 and a headed member 43 threaded in the shaft 42, normally urges the member 43 into engagement with the bottom of the sleeve 13 and holds a mouthpiece holding member 45 formed on the end of the shaft 42 above the tools mounted on the tool holder. The mouthpiece holding member is designed to receive an inverted telephone mouthpiece, of the type shown in Fig. 2, having partially formed holes 46 from which the material shown at 47-47 must be removed and having afmelding iin-`49 which also must be removed. In order to prevent the mouthpiece from rotating when it is moved into engagement with the tools, a plurality of pins -50 positioned in apertures 51-51 in the upper end of the shaft 42 are provided for engaging the partially formed holes in .the mouthpiece. Thesepins are slidable in the apertures 51 and are normally urged upwardly to engage the partially formed holes'in the mouthpiece by a spring 53 positioned'in-a cavity 54 iii the shaft 42 and between a disk 55 on which thepins rest land a rodv 'Zheldlinthe cavity by the headed! member 43.

A cover plate 53 having alcircular aperture 59 therein through which a mouthpiece may be passed to position it on the mouthpiecek holding member, is formed integral with a sub-base 61 secured to the housing 10 on which sub-base a standard 62 for supporting perforating apparatus, designated generally by the numeral 03, is mounted. The standard is secured to the sub-base by means of bolts 65-65 passed-through apertures-GG-GG in a base 67 of the standard and threaded inthe sub-base andhas at its upper end a vertically disposed cylindrical sleeve 09 formed integral therewith in which is slidably mounted a pei'- forator actuating shaft 7 0.v The perforator actuating shaft has an: aperture 71 therethrough in which a bolt 7 3 may be positioned for securing a perforatingdie 74 to the lower end of the perforator actuating shaft.

vertically reciprocable motion is imparted to the perforator actuatingshaft by' a manually controlled ylever 75 pivotally mounted on the standard at 77 aiidhaving a handle 7 8 formed at one end thereof and a counter balance 79 adjustably secured to theVV other end thereof by means of a set screw 81. This pivoted lever has a. projection 82 formedfthereon-to which a link-'83.

connected by a. pin S6 to a shoulder S5 of the perforator actuating shaft, is pivotally mounted bymeaiis of a second pin87.A

The perforating die 74 has a cylindrical portion 89 in which the bolt 73 is threaded and a second cylindrical portion 90 in which a recess' 91 Vand a plurality of apertures 93-93 are formed. A key 94 which engages tlieslots 95 and 97 formed inthe perforator actuating shaft and the. perforating die, respectively7 is secured toY the perforatiiig die bya screw 98:` This lrey serves to accurately position the perforatingdfie on. the perforatoi' Aactuating shaft so that perforating pins 99 'carried by the die 74 will register Vwith the partially formed holes 46 inthe telephone mouthpieces.

v The perforating pins are mounted on'thek cylindrical portion 90 of the perforating die by means of two plates 101 and 102, one 'of which, 101, has a plurality of apertures 103-103 through which the pins may be passedv until the heads 105-105of the-pins 99-99 engage beveled edges 10G-106 formed in thev apertures 103-10-3; The

, plates 101 and 102 are securedin the recess yond y a` predetermined u point by bolts 111-111 secured to thea-stripping plate and engaging shoulders (113-113 in apertures 93-93'. mrl`lie springs 110-110 which urge the stripping platedownwardly are Vposi-- tioned between thev stripping plate and shoulders 114-114 in the apertures 93-93 and encircle the bolts 111-111.

It is believed that a better understanding of this invention will be had by reference to the following description of the operation thereof. In the description of the operation it hasbeen4 assumed that the tools 33-33 are being rotated by the belt 30. An unfinstrained from 4movement downwardly beished mouthpiecemay be positioned on the mouthpiece holding member by setting it thereon and rotating it until the pins 50-50 register with partially formed holes 46-46 and are forced into the partially formed holes by the spring 53 to secure the mouthpiece against rotation. n

. The mouthpieces having been positioned on the mouthpiece holding member, handle 78 may be moved downwardly to move thev perfor'ating die into. engagement with the mouth piece and force it `against the action of spring ,40, pastthe constantly rotating tools 33-33 which willremove the molding Yfin *49.A ContinuedV movement of the han-` dle downwardly will cause the bottom of the Vmouthpiece. holding member to engage the upper surface of the sleeve- 13 at .115 and Vcause the perforating. pins to. punch the remaining material from the partially formed holes 46-46.r y V' y The handle 78 `may then be vmoved upwardly allowing the spring 40 to move the mouthpieceqholding member up untilM the mouthpiece is abovev theY tools 33-33.; Sil multaneously therewith the stripping-plate will be moved downwardlyfon therpeiforvat- Y ing pins by the .springs 110-110 to strip the Vmouthpiece from ,the perforating pins whereuponfthe'mouthpiece may be removedand the operation repeated.

Although th`s invention has` been yde-V scribed with referencetopunching and trimming telephone mouthpieces, it will be understood that Lit'- is applicable Vto the manufacture of Inia-ny othertypes of articles and appended claims. i

What is claimed iszfr I* .4,

1. Apparatus for punching and trimming` an article comprising means for supporting the article, spring actuatedmeans for'securing thev article against rotatiointools rotatable about the'supportingrmeans forl trimshould'be limited by thescope ofthe ming the article', meansi forv moving the article f izo into engagement with the tools, and means cooperating with and actuated by said last mentioned means for perforating the article.

2. Apparatus for punching and trimming an article comprising means for positioning the article, means for securing the article on the positioning means, tools rotatable about the positioning means for trimming the.

on the article holding member, means for compressing the spring to move the article past the tools to trim the edge therefrom, and means actuated by the last mentioned means for perforating the article.

4. Apparatus for punching and trimming an article comprising a sleeve, tools rotatable thereabout, a shaft slidable longitudinally Within the sleeve, means mounted on the shaft for securing an article positioned thereon against rotation, means for moving the shaft longitudinally of the sleeve to bring the article into engagement With the tools, perfolating pins cooperating With the last mentioned means for perforating the article, and a spring pressed stripping plate slidable on the perforating pins for stripping the article from the pins.

5. .An apparatus for punching and trimming an article comprising a sleeve, an article positioning shaft slidable longitudinally of the sleeve, a tool holding spindle rotatable about the sleeve, means for rotating the spindle, a spring normally holding the article positioning shaft in a predetermined position, resilient members positioned in the article holding shaft for securingI an article thereto, means for compressing the spring, perforating means carried by the last men` tioned means for perforating the article, and a stripping plate slidable on the perforating pins for removing the perforated article therefrom.

6. Apparatus for punching and trimming an article, comprising a plurality of rotatable tools, means for supporting the article, means for moving the article past the tools to trim the edges of the article, perforating pins carried by the last mentioned means for perforating the article, and a resiliently mounted stripping plate slidable on the perforating pins for stripping the article from the pins after it is perforated.

7. Apparatus for punching and trimming an article comprising yielding means for supporting the article and for securing it against rotation, a tool rotatable about the yielding means for trimming the article, means for moving the article into engagement with the tool, and means actuated by said last men tioned means for perforating the article.

In witness whereof, I hereunto subscribe my name this 4th day of December, A. D.

HAROLD LANGLEY BLOOD. 

